van Leeuwen, Erik Jan Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Pilipczuk, M., Pilipczuk, M., Sankowski, P., & van Leeuwen, E. J. (2014). Network Sparsification for Steiner Problems on Planar and Bounded-Genus Graphs. In R. Bilof, & M. Bartosik (Eds.), FOCS 2014 (pp. 276-285). Los Alamitos, CA: IEEE Computer Society. doi:10.1109/FOCS.2014.37.